Door for steam-generators, &amp;c.



T. DOWNIE. DOOR FOR STEAM GENERATORS, 6w.

APPLICATION EILEn JULY 16. 1907.

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T. DOWNIE.

DOOR FOR STEAM GENERATORS, 6w. APPLICATION FILED JULY 16. 1907.

923,156. Patented June 1,1909.

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THOMAS DOWNIE, OF WALLASEY, ENGLAND.

DOOR FOR STEAM-GENERATORS, 8250.

" 11 Regent road, Wallasey, in the county of Chester, England,have'invented new and useful Improvements in Doors for Steam-Generators, &c., of which. the following is a specification.

" This invention has reference primarily to the smoke doors of steamgenerators, that is to say, doors used in connection with chambersoffsteam generators where access has to be obtained occasionally, ormore or less often, for cleaning, and other purposes. Generally, suchdoors of steam generators are used forthe purpose of gaining access tochambersdisposed at the discharge end of tubes as inthe caseiofiire-tubesteam I generators for the purpose of getting at the tubes, and enablingthem to be swept or cleaned,"and in the case of damage, easily renewed;fwhile in the case of water-tube boilers, such doors would be employedat the aid ofthe accompanying headers, or similar. chambers or spaces,and in the casings'or walls of the generators, for gaining access to thespace between the tubes'.- But, as above stated, it may be ap pliedas anair-tight or water-tight door, for closing the openings or'ways throughpartitions,.bulkheads, walls, and the like, where it is desired to makea practically fluid-tight door, and which can be readily opened orclosedand manipulated. For convenience, however, the invention will bedescribed as a door for use as a smoke door or the like on steamgenerators.

The invention will be described with the drawings which illustrate it.

In these drawings, Figure 1 is a front elevation of the door; Fig. 2 isa side elevation, partly in section showing it partly opened y and Fig..3, is a back view of the door.

I A door according to this invention, comprisesalong each side aplurality of projecting'inclined or curved catches a; and at the loweredge similar inclined catches b. At the upper part it is provided withhinge I bars 0.

The body of the door consists of a plate d, and in the case shown, thisplate has a stiffening angle bar frame 6, riveted or fastened to it allaround and at the outside of the vertical side members of this frame thecatches a, come, they being on the frame, or secured to the plate d, orboth.

Specification of Letters Patent.

Application filed July 16, 1907.

Patented June 1, 1909.

Serial No. 384,089.

f is the plate or partition in connection with which the door operates;and the hole in the plate over which the door is adapted to fit whenclosed, is represented by the dotted line marked 9 in Fig. 1. Along eachside of this hole there is a frame or bar h, comprising or containing aplurality of projecting holding parts i, under which the catches cc ofthe door are adapted to slide in the looking or closing action, and bymeans of which the door is pressed toward the door frame or surface inconnection with which it fits and works, when lowered down by gravity.At the lower edge of the doorway, holders are provided for the lowerprojecting catches Z) to engage with.

The hinge bars 0 at the upper part of the door are so made as to inclineor lie obliquely to the plane of the door, so that when the door islifted, the upper part of it can and will move outward, and vice-versa.These hinges in the case shown, consist of the inclined bars 0, havingcorrespondingly inclined slots in them, a hinge pin 7c, and supported byprojecting carriers or brackets Z.

The door is adapted to be lifted and released by means of a chain orrope or the like m, secured to it at n, and operated by an overheadpulley, or tackle in any suitable known way. Or, it can be lifted andreleased by a cam 0, mounted on and operated by a spindle p on theinside of the door, the cam 0 when operated, being adapted to press onthe edge of the platef, forming the threshold of the door opening in it.When the door has been released, as hereinafter described, it can thenbe raised about the hinge pin 7c, by the chain or rope m in the usualway.

To release the door, to enable it to open, the catches a and I) must belifted so that their lower edges will stand above the upper edges of theprojecting holders i and j, respectively, in which position it will befree to swing forward upon the hinges; the catches a, in this action,passing through the spaces or gaps between the holders i. And,similarly, in closing the door, the catches and the holders must takethis relative position.

In connection with the door frame, at each side and at the upper part, astationary inclined device or cam g is provided, which projects outbeyond the face of the door they being fixed, in the case shown, on theouter surface of the uppermost holder '5. And upon these, the uppermostcatches a will slide 'or move in the operation of the door.

Namely, in closing the door, and pressing it inward at its lower part,these catches a will slide on the upper surface of the cams or inclinesg, and will so raise the door, that the catches a will pass over, inthis closing action, the upper edges of the holders i (and the catches bwill also pass over the upper edges of the holders and so theythe camsor inclines qguide the whole door into position for closing. And then,when it is pressed into the closed position, namely, so that the plate(Z will be close up' to the platef, the door will slide down, with theinclined catches a behind the holders 2', and the catches 1) within theholders or latches j; and these parts being suitably inclined or curvedon their engaging surfaces, they will press the door firmly intoposition, making close fit of the door plate (Z all around its edges, onthe er ges or frame of the plate f around the doorway or aperture (g)therein.

The door is adapted to be raised and lowered by the cam 0 from outsideby a handle or key fitted on to the spindle p and when it is lifting it,the edge of the cam acts on the edge of the lower part of the doorwayplatef, and so by turning itthe spindle pall the catches are raised outof the holders t and j as described, and the door, being released, canthen swing by its own gravity, about its hinge pin it, which lyingoutside and away from the plane of the door, tends to make it swingoutward. The door can then be opened to its full extent by the usual orany known suitable means.

In some cases, the door will rest when closed on the doorway plate f,metal to metal; while in others, a seating of a suitable fibrous softmaterial may' be provided on the edge of the door, 01' the edge of theplate around the doorway, by which a close joint between the door andits frame or seat, is provided.

ith regard to the action of the inclined projecting devices or cams q,as above stated, they serve to lift the door by the uppermost latches ariding upon them when the door is pressed toward the doorway plate, andwhen they have been pressed a certain distance, these upper wedges willmove into the space within the upper holders or latches "L, similarly asthe other latches or wedges pass behind the other holders or catches.The converse arrangement of the devices may be employed, if desired.

In some cases, as in steam generators wherein forced draft is employed,and the heat acting on the door is great, the door is held to the platef at the top edge as well as the bottom edge; and this is effected byemploying a bolt 1* on the back of the door plate d, fastened by a pinjoint 3 to the cam 0, and guided. by the guide 25, whereby when the dooris shut and the cam 0 in its upper position, the end of the bolt will beshot behind the plate f at the top of the doorway so that itthedoorcannot move away from the plate f, by warping tendencies due toheat, but is held rigidly in position, fitting closely against it.

What is claimed is 1. A door for steam generators comprising a door-wayhaving vertical recesses in its side edges, a door having projections onits side edges adapted to engage with said recesses when the door isclosed, a horizontal rod located above the door-way, and slotted hingessecured to the top of the door with the slots receiving said rod.

2. A door for steam generators comprising a doorway having verticalrecesses in its edges and cam shaped projections near its upper end, adoor having inclined projections on its edges adapted to engage withsaid recesses when the door is closed and the two upper projectionsengaging with the cam shaped projections on the doorway when the door ispartially opened, plates secured to the upper end of the door havinginclined slots therein, and a rod on the doorway adapted to engage inthe said. slots to form a hinge for the door.

3. The combination of a door having wedge shaped projections at itsedges, and slotted hinge bars, a doorway frame having recesses in itsedges adapted to engage with said projections on the door, hinge pinswith which the hinge bars have sliding movement. cam shaped devices onthe upper part of said frame adapted to engage with the uppermostprojections on the door for enabling the door to be raised and lowered.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

T IIOIMILS DOWNIE.

vi itnesses SoiinRvrLLe GOODALL, GUY ORE.

